Looks like pretty impressive monthly revenues for some of them eg. Leon & George. If YC is the first investor (which is what I expect) they have done very well being bootstrapped so far.
I don't understand Leon & George though (plant delivery). The TC bio talked about finding the right plant for your space. Seems like they just sell a few plants. I can walk into any florist, garden store or even IKEA and get the same or better selection. So the value prop is delivery I guess? But does delivery large plants across the country scale?
Bloom & Wild (https://www.bloomandwild.com/) do flower delivery and they're doing very well. They're only in the UK at the moment, but I think they have plans to expand internationally.
Seems like it's just exploiting the Instagram/"aesthetics" crowd who are too lazy/dumb/rich to go to a nursery. LA has a ton of nurseries, and fiddle leaf fig trees can be found for $60 (4 ft) and $150 (6ft). Actually the planters (pots) are actually more expensive than the plants. Real Case Study planters go for $150-300. You might as well get a fake off of Etsy for half price.